bugtool: Collect BPF cgroup programs related information
bugtool: Collect BPF cgroup programs related information

`bpftool cgroup tree [CGROUP_ROOT]` [1] provides information
about BPF cgroup programs attached at the specified cgroup root.
This is particularly useful in checking if the programs are attached
at the right cgroup hierarchy.

[1] https://manpages.ubuntu.com/manpages/focal/man8/bpftool-cgroup.8.html

Signed-off-by: Aditi Ghag <436242e0c0af36e461a395c937165372864a99f9@cilium.io>

michi-covalent/cilium,michi-covalent/cilium,tklauser/cilium,cilium/cilium,cilium/cilium,tklauser/cilium,tklauser/cilium,michi-covalent/cilium,cilium/cilium,tklauser/cilium,michi-covalent/cilium,cilium/cilium,tklauser/cilium,cilium/cilium,michi-covalent/cilium